package collection;

import java.util.Collection;
import java.util.ArrayList;

public class CollectionDemo {
    public static void main(String[] args) {
        Collection c = new ArrayList();
        c.add(new Point(1,2));
        c.add(new Point(2,3));
        c.add(new Point(3,4));
        c.add(new Point(5,6));
        c.add(new Point(9,8));
        c.add(new Point(4545,4858));
        System.out.println(c);

        Point p = new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println("集合c是否包含p:"+contains);

       /* Point p = new Point(1,2);
        boolean contains = c.contains(p);
        System.out.println("是否包含p:"+contains);*/

        //删除
        //boolean remove(Object o):是boolean类型，但一般都不接受boolean结果
        //从当前集合中删除与给定元素o的equals（）比较为true的元素
        //若存在重复元素则只删除一次
        c.remove(p);
        System.out.println(c);

        //集合中存放的是元素的引用（地址）
        Collection cc = new ArrayList();
        Point pp = new Point(100,200);
        cc.add(pp);//将cc装到pp中----------将pp的引用装到cc中
        System.out.println(pp);
        System.out.println(cc);
        pp.setX(1000);
        System.out.println(cc);

      /*Collection c = new ArrayList();
      c.add("one");
      c.add("two");
      c.add("three");
      c.add("four");
      c.add("five");
      c.add("six");
        System.out.println(c);

        System.out.println("size:"+c.size());
        System.out.println("是否为空集："+c.isEmpty());
        //isEmpty()判断集合是否为空集（size()为0表示空集）
        c.clear();
        System.out.println("集合已清空");
        System.out.println("size:"+ c.size());
        System.out.println("是否为空集"+c.isEmpty());*/


    }
}
